"Collapse: How Societies Choose to Fail or Succeed", °ÄÃÅÁùºÏ²Ê¿ª½±app, February 27, 2012
/winner/collapse-how-societies-choose-fail-or-succeed (Accessed September 20, 2024)
Document ID: 1a6c651b-db7a-4567-99d0-98061a2d7de1
